click and drag around in the editor-thing. you can change which parameter you're editing by pressing the number keys or using the Dimension drop-down. try playing with the sliders too.

about

it's essentially a fancy musicshapeeditor designed to be more interactive and fun. the musicshape is visualized in a circle (because it plays in a loop), and you can freely edit any parameter. you can switch among four (yes, four! wow) shapes to have different loops. you can change instruments (which will generate new shapes).

keyboard: when the blue editor has focus (when it was the last thing you clicked) you can use the number keys to go through the dimensions, and the arrow keys to step through the sequence and edit it.